3D printing of solution processed ceramics
The traditional ceramics-making process involves mixing, molding, and sintering of the green body produced to obtain a densified and high mechanical strength ceramics. However, cracking during both forming and sintering stages is a common issue leading to product failure. Chemically bonded pho...
Saved in:
Main Author: | |
---|---|
Other Authors: | |
Format: | Final Year Project |
Language: | English |
Published: |
Nanyang Technological University
2024
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/176091 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-176091 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1760912024-05-18T16:46:18Z 3D printing of solution processed ceramics Lee, Yan Yi Nripan Mathews School of Materials Science and Engineering Nripan@ntu.edu.sg Engineering The traditional ceramics-making process involves mixing, molding, and sintering of the green body produced to obtain a densified and high mechanical strength ceramics. However, cracking during both forming and sintering stages is a common issue leading to product failure. Chemically bonded phosphate ceramic (CBPC) is an advanced ceramics alternative that relies on chemical bonding by acid-base reaction to obtain its mechanical properties, eliminating the need for high-temperature sintering. Although the properties of CBPC will be different from traditional ceramics as it is not as dense and strong, it has its unique properties which include being fireproof, resistant to corrosion, and a form of nuclear-shielding protectant. Additive manufacturing has been integrated into the ceramics production industry. It offers a more environmentally friendly and cost-effective alternative to traditional ceramics manufacturing with greater freedom in the design of products. The integration of CBPC into additive manufacturing is possible using Direct Ink Writing (DIW) which makes use of the extrusion base method of viscous slurry which the CBPC mixture can be before hardening. However, no extensive research on CBPC being used in additive manufacturing has been done. This research study will therefore revolve around exploring the feasibility of pairing DIW with CBPC, optimising the printing process, and analysing and characterising the feedstock and printed samples. This project is a continuation of a previous project where an optimum printing CBPC slurry is produced: Wollastonite-CBPC with the addition of boric acid. During the experiment, different shapes and patterns were trialed for printing. Viscosity is an important factor in the success of DIW printing where optimum printing viscosity was achieved by varying the slurry temperature. The low temperature goes against the exothermic reaction of the CBPC hardening process, slowing it down. The extrusion process was controlled by the pressure which is proportional to the viscosity of the slurry. The optimal printing slurry pressure should coincide with the viscosity to extrude smoothly without a burst or drip phenomenon at the tip which will affect the dimension printed. Knowing the parameters to control printing allows the control of the resolution of print and the success in printing layered 3D objects. From the characterisation results it can be concluded that the CBPC printed sample has a relatively low hardness as compared to traditional ceramics. This coincides with the low density measured. Having low density would imply good insulation and heat storage capacity due to high porosity. Therefore, an effective thermal barrier and a lighter option of ceramics. Bachelor's degree 2024-05-13T12:14:02Z 2024-05-13T12:14:02Z 2024 Final Year Project (FYP) Lee, Y. Y. (2024). 3D printing of solution processed ceramics. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/176091 https://hdl.handle.net/10356/176091 en application/pdf Nanyang Technological University |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Engineering |
spellingShingle |
Engineering Lee, Yan Yi 3D printing of solution processed ceramics |
description |
The traditional ceramics-making process involves mixing, molding, and sintering of
the green body produced to obtain a densified and high mechanical strength ceramics.
However, cracking during both forming and sintering stages is a common issue leading
to product failure. Chemically bonded phosphate ceramic (CBPC) is an advanced
ceramics alternative that relies on chemical bonding by acid-base reaction to obtain its
mechanical properties, eliminating the need for high-temperature sintering. Although
the properties of CBPC will be different from traditional ceramics as it is not as dense
and strong, it has its unique properties which include being fireproof, resistant to
corrosion, and a form of nuclear-shielding protectant. Additive manufacturing has
been integrated into the ceramics production industry. It offers a more environmentally
friendly and cost-effective alternative to traditional ceramics manufacturing with
greater freedom in the design of products. The integration of CBPC into additive
manufacturing is possible using Direct Ink Writing (DIW) which makes use of the
extrusion base method of viscous slurry which the CBPC mixture can be before
hardening. However, no extensive research on CBPC being used in additive
manufacturing has been done.
This research study will therefore revolve around exploring the feasibility of pairing
DIW with CBPC, optimising the printing process, and analysing and characterising
the feedstock and printed samples. This project is a continuation of a previous project
where an optimum printing CBPC slurry is produced: Wollastonite-CBPC with the
addition of boric acid.
During the experiment, different shapes and patterns were trialed for printing.
Viscosity is an important factor in the success of DIW printing where optimum
printing viscosity was achieved by varying the slurry temperature. The low temperature goes against the
exothermic reaction of the CBPC hardening process, slowing it down. The extrusion process
was controlled by the pressure which is proportional to the viscosity of the slurry.
The optimal printing slurry pressure should coincide with the viscosity to extrude smoothly
without a burst or drip phenomenon at the tip which will affect the dimension printed.
Knowing the parameters to control printing allows the control of the resolution of print
and the success in printing layered 3D objects. From the characterisation results it can
be concluded that the CBPC printed sample has a relatively low hardness as compared
to traditional ceramics. This coincides with the low density measured. Having low
density would imply good insulation and heat storage capacity due to high porosity.
Therefore, an effective thermal barrier and a lighter option of ceramics. |
author2 |
Nripan Mathews |
author_facet |
Nripan Mathews Lee, Yan Yi |
format |
Final Year Project |
author |
Lee, Yan Yi |
author_sort |
Lee, Yan Yi |
title |
3D printing of solution processed ceramics |
title_short |
3D printing of solution processed ceramics |
title_full |
3D printing of solution processed ceramics |
title_fullStr |
3D printing of solution processed ceramics |
title_full_unstemmed |
3D printing of solution processed ceramics |
title_sort |
3d printing of solution processed ceramics |
publisher |
Nanyang Technological University |
publishDate |
2024 |
url |
https://hdl.handle.net/10356/176091 |
_version_ |
1806059899544666112 |